Level 8 - I canit remember how I got the chip, but this is how to do the level . . .

do 'B' twice, and then walk out to the end of the 3-block spur pointing right. Walk right to the end, keep holding ->, and press C just before you start falling down. YOu should be able to stand on the end of the spur (1-block wide). Gently drop off the edge, and fall until roughly 3apaces down (just before the rock). Hit B, and fall to the bottom. You can then get to the key. The end is reasonably easy. (^.^)

Level 11 - Press B ->, to get to the nearby block. Then use <- to drop onto the next block. Press C twice, and drop along 1block left. Press B twice. Next go left, and press B before you fall. You need to go pretty much as far as you can without dying. This should get you to the next side, where you repeat this to get the key. This bit does take quite a bit of practice.

Drop off the block, going right, and press C. Press B, and direct yourself as you fall to the safe block on your left. Press B, and direct yourself again to land on a safe block. This bit might take some practice, too. Press B twice, and then fall off, going left. I find it easier top then land on the safe block 3spaces 1left of the green light, and then drop off onto it. (^.^)